<script setup name="BatchActionBar">
const props = defineProps({
    data: {
        type: Array,
        default: () => []
    },
    selectionData: {
        type: Array,
        default: () => []
    }
})

const emit = defineEmits(['check-all', 'check-null'])

const checkAll = computed({
    get: function() {
        let flag = false
        if (props.data.length != 0 && props.data.length == props.selectionData.length) {
            flag = true
        }
        return flag
    },
    set: function(newVal) {
        newVal ? emit('check-all') : emit('check-null')
    }
})

const isIndeterminate = computed(() => {
    let flag = false
    if (props.selectionData.length > 0 && props.selectionData.length < props.data.length) {
        flag = true
    }
    return flag
})
</script>

<template>
    <div class="batch-action-bar">
        <el-checkbox v-model="checkAll" :indeterminate="isIndeterminate" :disabled="!data.length">当页全选</el-checkbox>
        <div v-if="selectionData.length" class="tips">已选 {{ selectionData.length }} 项</div>
        <el-form :disabled="!selectionData.length">
            <slot />
        </el-form>
    </div>
</template>

<style lang="scss" scoped>
.batch-action-bar {
    display: flex;
    align-items: center;
    margin: 20px 0;
    padding: 0 10px;
    &:first-child {
        margin-top: 0;
    }
    .el-checkbox {
        margin-right: 20px;
    }
    .tips {
        margin-right: 20px;
        color: #909399;
        font-size: 13px;
    }
    :deep(.el-form) {
        > .el-button {
            margin-right: 10px;
        }
        > .el-button-group {
            margin-right: 10px;
        }
    }
}
</style>
